Based on the high net slot filling rate, the forming winding can make the iron core length shorter and the torque density higher when the rated power, cooling system, inner and outer diameters of stator, and stator slot area keep unchanged. The traditional upper and lower double-layer forming winding structure with pitch 1 is changed to left and right structure, in which the forming difficulty of winding is reduced and the production efficiency is improved. Due to the large width of slot opening, the harmonic content in the air gap magnetic flux density will be increased and the operation stability will be reduced. Thus, the Taguchi method is used to optimize the cogging torque and output torque of motor with air gap length and stator slot width and depth as optimization variables. The finite element analysis model of the motor is established and simulation is performed with this model. The prototype experiment verifies the rationality of the design of the forming winding.